As of the census of 2000, there were 7,228 people, 2,898 households, and 1,872 families residing in the city. The population density was 631.4/km sq (1,633.6/mi sq). There were 3,154 housing units at an average density of 275.5/km sq (712.8/mi sq). The racial makeup of the city was 96.00% White, 0.37% African American, 0.30% Native American, 0.37% Asian, 0.07% Pacific Islander, 2.01% from Race (United States Census)other races, and 0.87% from two or more races. Hispanic or Latino of any race were 4.40% of the population. There were 2,898 households out of which 31.0% had children under the age of 18 living with them, 51.3% were Marriagemarried couples living together, 10.2% had a female householder with no husband present, and 35.4% were non-families. 30.7% of all households were made up of individuals and 16.1% had someone living alone who was 65 years of age or older. The average household size was 2.40 and the average family size was 3.01. In the city the population was spread out with 25.8% under the age of 18, 7.4% from 18 to 24, 25.4% from 25 to 44, 22.3% from 45 to 64, and 19.0% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 89.9 males. For every 100 females age 18 and over, there were 85.0 males. The median income for a household in the city was $34,952, and the median income for a family was $42,860. Males had a median income of $29,507 versus $19,859 for females. The per capita income for the city was $16,969. About 6.3% of families and 9.3% of the population were below the poverty line, including 12.0% of those under age 18 and 7.7% of those age 65 or over. This city is known as "The Home of Arbor Day" due to its close propinquity to Arbor Lodge State Historical Park and ArboretumArbor Lodge, home of the first Secretary of Agriculture of the United States, J. Sterling Morton, who enthusiastically promoted the planting of trees on the prairie for shade, fruit, and windbreaks. The National Arbor Day Foundation has its headquarters near his home in Nebraska City. http://www.sos.state.ne.us/knwing_ne.html Slaves were first bought and sold in the 1850s in Nebraska City. http://www.shgresources.com/ne/history/ Source: http://en.wikipedia.org/wiki/Nebraska_City%2C_Nebraska